Every authorized health care service contractor, upon canceling, denying, or refusing to renew any individual health care service contract, shall, upon written request, directly notify in writing the applicant or subscriber, as the case may be, of the reasons for the action by the health care service contractor. Any benefits, terms, rates, or conditions of such a contract which are restricted, excluded, modified, increased, or reduced shall, upon written request, be set forth in writing and supplied to the subscriber. The written communications required by this section shall be phrased in simple language which is readily understandable to a person of average intelligence, education, and reading ability.